A roller crusher that uses two rotating rollers to crush materials. It consists of motor, bracket, fixed roller, movable roller and safety spring. The roller surface is mostly smooth, the active roller bearings can be moved along the frame, and strong safety spring is used to support the bearings. The bearings can be removed and spit out when the objects are especially hard. Before normal operation, the gap between two rollers should be adjusted with gasket to ensure breaking ratio.